Speed-indicator.



L. WORK.

SPEED INDICATOR. VAPPLIOATION FILED FEB. 29, 1908.

Patented Nov. 3,- 1908.

INVENTOR WITNESSES: 15% 03%4w ATTORNEY LEONARD WORK, OF WILKINSBURG, PENNSYLVANIA.

SPEED-INDICATOR.

Specification of Letters Patent.

Patented Nov. 3, 1908.

Application filed February 29, 1908. Serial No. 418,504.

To all whom it may concern:

Be it known that I, LEONARD WORK, a citizen of the United States, and a resident of Vilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Speed-Indicators, of which the following is a specification.

My invention relates to speed indicators, and particularly to that class of indicators in which the number of revolutions made by a shaft or other part during a predetermined period of time is registered at the expiration of that. period.

The object of my invention is to provide a device of the character indicated that shall be very simple to operate and shall be so arranged as to eliminate the personal equation of the operator from the accuracy of the indications.

The device is distinguished from others in that it comprises a member that is manually operable against a spring to effect operative connections between an indicator and a spindle adapted to be actuated by the shaft or other part the speed of which it is desired to ascertain, and between a continuously operating clock or other suitable timing mechanism and a device for automatically determining the period of time during which the said operative connections shall be maintained. I

. Figure 1 of the accompanying drawings is a plan view of a device that is constructed in accordance with my invention, some of the parts being broken away for the sake of clearness of illustration. Fig. 2 is a view in end elevation and insection of the device. Fig. 3 is a planvview looking upwardly at the top plate of the device, and Fig. l'is an enlarged perspective View of some of the parts.

Mounted upon the upper face of a casing 1 that contains any suitable clock mechanism 2 comprising a pinion 3 is a device 4 for indicating the number of revolutions made by a spindle 5 having a sharpened outer end adapted to be inserted into the end of a shaft, or that may be provided with other suitable means for obtaining rotary motion from another part. The indicating device 4 comprises a stationary dial plate 6 and an overlapping disk 7 having its edge beveled and provided with an index 8 adapted to registerwith the subdivisions upon the dial plate 6. The disk 7 is mounted upon the outer end of a short shaft 9 that projects through a slot 10 in the stationary dial plate 6 and carries, near or at its middle, a gear 11 adapted to mesh with a worm gear 12 formed upon the inner end of the spindle 5. The gear ratio and the subdivisions upon the dial plate 6 are so adjusted with respect to each other that one revolution of the spindle 5 will cause the index 8 to move over one division of the dial, and, by reason of the provision of the slot at 10 in the dial plate,

the shaft 9 may be moved transversely of its axis sufficiently to permit of effecting engagement or disengagement between the gears 11 and 12.

Movement of the gears 11 and 12 into and out of engagement is effected by means of a bifurcated arm 13 that may be moved downwardly to the position shown in full lines in Fig. 3 by means of a button 14: that projects from the side of the casing at a convenientlocation to be pressed by the finger of the operator and is normally maintained in its uppermost position by means of a spring 15. ltotatably mounted at the free end of the said arm and rigidly connected together are a disk 16 having notches in its periphery and a gear 17 adapted to engage with the pinion 3 of the clock mechan sm when the button 1 1 is pressed inward; 2'. 6., when the arm 13 occupies the full line-position in Fi 3.

The gear 16 is maintained in operative engagement with the pinion 3 during the time that a stop 18 bears upon the edge of the disk 17, and is permitted to become disengaged therefrom when a notch in the disk is brought opposite the stop, the spring 15 serving to cause the stop to occupy one of the notches and to thereby effect such dis ci'igagement automatically. The notches in the periphery of the disk are spaced at such intervals that suitable predetermined periods of time, such, for instance, as half minutes or minutes, will elapse between the time when the stop 18 is released from one notch until it is caused to occupy the next notch. The arm 13 is also provided with a pin 19, that projects into a recess in a screw 20 that is threaded in the inner end of the shaft 9, the said pin serving to move the gear 11 into and out of operative engagement with the worm gear 12 simultaneously with the movement of the gear 16 into and out of operati ve engagement with the pinion 3.

In the operation of the device, the disk 7 is first moved so as to bring the index 8 thereon opposite the Zero or other suitable mark or division upon the dialv plate 6, which may be readily done when the button 14 is in its outermost position because there is then no connection between the said disk and the spindle. The spindle is next applied to the end of the shaft, or to any other part the speed of operation of which it is desired to ascertain, and when it has been carefully centered, or when it is desired to cause the registration to begin, the button 14 is pressed, thus causing the gear 16 to mesh with the pinion 3, the gear 11 to mesh with the worm gear 12 and the stop 18 to release the notched disk 17 The motion of the spindle 5 will then be transmitted to the index disk 7, while the clock pinion 3 will effect rotation of the gear 16 and of the disk 17. Vhen the disk 17 has been rotated slightly the notch therein that was previshereby serving to prevent interruption of the operative connections between the gears 3 and 16 and between gears 11 and 12. When another notch has been brought opposite the stop, the arm 13 will be moved automatically by the spring 15 to cause the stop to enter the notch and to cause severance of the said operative connections. The division upon the dial 6 then lying opposite the index 8 represents the number of revolutioiis made by the s indle 5 during the period predetermined y the distances between the notches in the disk 17. Thus it is seen that the index of the indicating device may be readily and conveniently set at the zero or other desired position, that the spindle may be carefully centered with or otherwise adjusted with respect to the rotating member without interfering with the setting of the indicating device, and that no delays in the oper tion occur owing to delays in the startingof the clock mechanism.

I i-laim as my invention:

1. The combination with'a rotatable member, an indicating device, and continuouslyoperating clock mechanism, of a movable member, time-measuring means carried thereby, means governed by the movable member for effecting operative connections simultaneously between the clock mechanism and the time-measuring means and between the.

indicating device and the rotatable member,

and means cooperating with the time-measuring means to either maintain or permit interruption of said operative connections.

2. The'combination with a rotatable member, an indicating device,'and continuouslyoperating clock mechanism, of a movable member, time-measuring means carried thereby, means governed by the movable member for effecting operative connections simultaneously between the clock mechanism and the time-measuring means and betweenthe indicating device and the rotatable member and means for efi'ecting interruption of said connections at the expiration of a period predetermined by the time-measuring means.

3. The combination with a rotatable member, an indicating device, and continuouslyoperating 'clock'mechanism, of a movable member, a notched wheel carried thereby, means governed by the movable member for effecting operative connections simultaneously between the notched wheel and the clock-work and between the indicating device and the rotatable member, and a stationary detent adapted to engage the periphery of the wheel in order to maintain the said connections or to occupy the notches therein in order to permit interruption of said connections.

1. The combination with a normally freely rotatable member, an indicating device, con,-

tinuously-operating clock mechanism, and

time-measuring means, of manually actuatcd means independent of the rotatable member for effecting operative connections simultaneously between the clock mechanism and the time-measuring means and between the indicating device and, the rotatable member, and. means for thereafter maintaining said operative connections during a period predetermined by the time-measuring means.

5. The combination with continuouslyopcrating clock mechanism, time-measuring means, a rotatable member, and an indicat ing device comprising a member normally movable independently of other parts, of means for effecting operative connections simultaneously between the rotatable member and the indicating device and between the time-measuring means and the clock mechanism, and means for automatically interrupting the said connections at the ex piration of a period predetermined by the time-measuring means. 4

In testimony whereof, I have hereunto subscribed my name this 24th day of February, 1908.

LEONA D WORK. Witnesses O'r'ro'S. SOHAIRER, Bnmmr HINES. 

